Telephone-transmitter.



No. 851,355. PATENTED APR. 23, 1907.

' s. 0. HOUGHTON. I

TELEPHONE TRANSMITTER.

APPLIGATION FILED MAR. 7. 1907. I

UNITED STATES PATENT OFFICE.

STEPHEN O. HOUGI-ITON, OF ROME, NEW YORK, ASSIGN OR TO THE WIRE &

TELEPHONE COMPANY OF AMERICA, OF ROME, NEWV YORK, A CORPO- RATION OF NEWV YORK.

TELEPHONE-TRANSMITTER.

Specification of Letters Patent.

Patented April 23, 1907.

To all whom it may concern:

Be it known that I, STEPHEN O. Honou- TON, of Rome, county of Oneida, State of New York, have invented an Improvement in Telephone-'lransmitters, of which the following description, in connection with, the accompanying; drawings, is a specification, like characters on the drawings representing like parts. i

This invention relates to telephone transmitters, and has for its object to improve the construction of the same to the end that the sound vibrations of the person talking shall be clearly transmitted, all other sound vibra tions, more or less distant from the transmitter, having little effect upon it. By my invention the use of the ordinary projecting mouth-piece is avoided.

My invention also has for its object to so construct and arrange the transmitter that the passages through which the vibrations pass shall be protected against the liability of becoming clogged with dust, dirt, etc.

Figure 1 shows in side elevation a telephone transmitter embodying this invention. Fig. 2 is a front view of the telephone transmitter shown in Fig. 1. Fig. 3 is a vertical section of a face plate of thetransmitter and ofgthe mouth piece. Figs. 4 and 5 are front and edge views respectively of the mouth piece removed.

a represents the face-plate of the transmitter, which is herein shown as made circular and as having a circular centrally disposed hole through it adapted to receive a disk I). The disk, which is adapted to be placed in said hole in the face-plate is preferably circularly formed, and has a groove 1) formed in it, which is adapted to collect the only, as for instance the voice vibrations of the person talking. This groove is circularly formed and is located near the edge of the disk and is extended inward from the outer face of the disk and entirely around it. This groove may be formed by spinning or drawing the metal or it may be otherwise formed. By forming the groove in the disk in this manner a circular projection is produced at the opposite side of the disk.

In the bottom of the groove or in one or both Walls thereof, is provided a series of Small perforations represented at 2, 3, for the sound vibrations of the immediate vicinity passage of the vibrations through the disk. These perforations may be formed for convenience by drilling the circular rib in a radial direction toward the center of the disk, the drill penetrating both walls of the rib, yet so far as my invention is concerned they may be otherwise formed. The perforaations, it will be observed, are small and numerous. The central portion of the disk, inside of said groove, is imperforate and slightly convex, yet it may be otherwise formed. The edge I) of the disk is or may be turned over to serve as a stop which is adapted to bear against theface-plate a, at the edge of the hole therein, when the disk is placed in position for use. The outside diameter of the rib, which is produced by forming the groove, is approximately the same as the diameter of the hole in the face-plate, so that the disk may be thrust into said hole with the circularly formed rib in engagement with the edge of the hole.

By arranging the small perforations at the bottom of the groove, in the side walls thereof, it will be seen that they are well protected from dust and dirt which cannot easily enter the groove, yet the sound vibrations entering the groove will pass freely through said perforations. The manner herein shown of connecting the disk with the face-plate is simple and provides for readily detaching itwhenever desired. But I do not desire to limit my invention to this particular manner of attaching the disk to the face late, or to making the disk removable, an in fact the disk may be formed integral with the face-plate if desired.

Having thus described myinvention, what I claim as new and desire to secure by Letters Patent is i 1. A telephone transmitter having a faceplate having an inwardly extending groove provided with perforations, substantially as described.

2. A telephone transmitter having a faceplate formed with an inwardly extending circular groove provided with perforations at the bottom, substantially as described.

3. A telephone transmitter provided with a face-plate having a groove provided with two series of perforations, arranged in the opposite walls thereof, at the bottom, substantially as described.

a face-plate having a hole through it, a disk having a circular groove provided With perforations at the bottom, the rib produced by forming said groove projecting through the hole in said face-plate and fitting it snugly, to thereby hold the disk in place, substantially as described.

6. A telephone transmitter provided with a face-plate having a hole through it, a disk having a marginal groove provided with two series of perforations arranged in the opposite walls thereof, at the bottom, and an imperforate central portion, the rib produced by forming said groove projecting through the 20 hole in said face-plate and fitting it snugly to thereby hold the disk in place, substantially as described.

7. A telephone transmitter provided with a face-plate having a hole through it, a disk having a circular groove provided with two series of perforations arranged in the opposite walls thereof, at the bottom, the rib produced by forming said groove extending through the hole in said face-plate, substano tially as described.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

STEPHEN C. HOUGHTON.

Witnesses.

B. J. NoYEs,

H. B; DAVIS. 

